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https://hdl.handle.net/2440/37507
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Type: | Journal article |
Title: | Discovery of very high energy γ-ray emission from the BL Lacertae object H 2356-309 with the HESS Cherenkov telescopes |
Other Titles: | Discovery of very high energy gamma-ray emission from the BL Lacertae object H 2356-309 with the HESS Cherenkov telescopes |
Author: | Aharonian, F. Akhperjanian, A. Bazer-Bachi, A. Beilicke, M. Benbow, W. Berge, D. Bernlohr, K. Boisson, C. Bolz, O. Borrel, V. Braun, I. Breitling, F. Brown, A. Buhler, R. Busching, I. Carrigan, S. Chadwick, P. Chounet, L. Cornils, R. Costamante, L. et al. |
Citation: | Astronomy and Astrophysics: a European journal, 2006; 455(2):461-466 |
Publisher: | E D P Sciences |
Issue Date: | 2006 |
ISSN: | 0004-6361 1432-0746 |
Statement of Responsibility: | F. Aharonian ... G. Rowell ...and M.Ward [et al] |
Abstract: | The extreme synchrotron BL Lac object H 2356-309, located at a redshift of z = 0.165, was observed from June to December 2004 with a total exposure of ≈40 h live-time with the HESS (High Energy Stereoscopic System) array of atmospheric-Cherenkov telescopes (ACTs). Analysis of this data set yields, for the first time, a strong excess of 453 γ-rays (10 standard deviations above background) from H 2356-309, corresponding to an observed integral flux above 200 GeV of I(>200 GeV) = (4.1 ±0.5) × 10 -12 cm -2 s -1 (statistical error only). The differential energy spectrum of the source between 200 GeV and 1.3TeV is well-described by a power law with a normalisation (at 1 TeV) of N 0 = (3.00 ±0.80 stat ± 0.31 sys)× 10 -13 cm -2 s -1TeV -1 and a photon index of Γ = 3.09 ± 0.24 stat ± 0.10 sys. H 2356-309 is one of the most distant BL Lac objects detected at very-high-energy γ-rays so far. Results from simultaneous observations from ROTSE-III (optical), RXTE (X-rays) and NRT (radio) are also included and used together with the HESS data to constrain a single-zone homogeneous synchrotron self-Compton (SSC) model. This model provides an adequate fit to the HESS data when using a reasonable set of model parameters. © ESO 2006. |
Keywords: | gamma rays: observations galaxies: active galaxies: BL Lacertae objects: individual: H 2356-309 |
Rights: | © The European Southern Observatory 2006 |
DOI: | 10.1051/0004-6361:20054732 |
Published version: | http://dx.doi.org/10.1051/0004-6361:20054732 |
Appears in Collections: | Aurora harvest 6 Physics publications |
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